Automatic time control for tuned circuits



Nov. 10, 1936. T. A. CHENEY ET AL AUTOMATIC TIME CONTROL FOR TUNED CIRCUITS 2 Sheets-Shet 1 Filed March 28, 1932 ThomasACYzeneg Nov. 10, 1936.

T. A CHENEY ET AL I 2,060,037

AUTOMATIC TIME CONTROL FOR TUNED CIRCUITS Filed March 28, 1932 2 Sheets-Sheet 2 ThomasACYzeneg HarrgJiGm/m INVENTORS UNITED STATES PATENT OFFICE AUTOMATIC TIME CONTROL FOR TUNED CIRCUITS Thomas A'. Cheney and Harry J. Krinke, Seattle, Wash.

Application March 28,

18 Claims.

Our invention relates in its general aspect to a device for controlling a circuit capable of being tuned, whereby such circuit can be so tuned as to be responsive to a given wave length at a selected time, and thereafter can be shifted to be tuned to a different wave length at some future time, or can be deenergized, and after either such occurrence can again be tuned, to the same or a different wave length, and shifted as before, being reenergized if it had been deenergized.

More specifically, and since the device is designed'with the purpose of adapting it to the control of radio receiving sets, its purpose can be indicated by noting that through its use a radio receiving set can be automatically operated after a single setting of the device to turn on to some particular station A at wave length a at a given hour, can then be shifted to another station B at wave length b, either higher or lower thanwave length a; at a later hour, or, in lieu thereof, can be shut off completely, and thereafter, either after it has been shut off or has been shifted, it' can be shifted to another station C at a later hour and turned on, if it has been shut off; or, if it is desirable at that later time to reenergize the circuit to pick up a station-for instance, station B-to which it was previously tuned, this can take place.

In effect, then, and referring to the specific object for purposes of illustration, it is possible, after determining in advance what programs the listener wishes to hear during a day or an evening, to set the control to turn the set on to station A at a given hour, say at 6:00 o'clock, to turn off completely at 6:30, to turn on again to station B at 6:45, to shift to station C at 7:00 oclock, to shift to station A at 'I :30, to stop at 7:45, to again turn on to station A at 8:00 oclock, to shift to some other station at 8:15, or to be stopped completely, and so on, setting up in advance those stations, whether different stations or repetitions of the same station, at the certain hours when those programs are on whichit is desired to hear. Thus, the operator can always be sure that the radio receiving set will, without further attention, turn on to those programs which he wishes.

to hear, and turn off to eliminate programs he will not want to hear, and to do all of this in advance so that he need not approach the instrument later.

It is a further object to provide a device capable of accomplishing these ends, yet without interfering with the manual control of the radio set, if tha.t be desired, and in which operation of the manual control: does not render inoperative later 1932, Serial No. 601,612

automatic operation for which the set is prepared.

It is a further object to combine with a control such as has been indicated an automatic volume control, so that the different stations, normally of different volume, will each come in with requisite volume.

The above indicates the general objects. and the more specific objects may be ascertained as the present specification progresses.

Our invention comprises the novel parts, and the novel combination thereof and the arrangement relative to parts of the tuned circuit or radio receiving set, all as is shown in a diagrammatic manner in the accompanying drawings, and as will be hereinafter made clear in this specification and defined by the claims which terminate th same.

In the accompanying drawings we have shown our device prepared for incorporation in a radio receiving set, and in a manner which illustrates the principles of our invention.

Figure 1 is a general diagrammatic view of the complete automatic control system.

Figure 2 is a front elevation of a radio set equipped with our control.

Figure 3 is an elevation of the dial of the timekeeping mechanism.

Figure 4 is a vertical transverse section through the control portion of the time-keeping mechanism.

Figure 5 is a diagrammatic sectional view of an additional control.

In effect, our invention depends for its operation upon a time-keeping mechanism of any suitable character, in conjunction with which certain contact elements, such as contact plugs, are positioned to correspond to different periods of time-for instance, spaced every fifteen minutes apart-and are disposed in the path of contact arms moved by or with the time-keeping mechanism, whereby, at the corresponding time, upon suitable previous manipulation of the plugs, contact can be established, on the one hand, with circuits controlling shifting of a circuit tuning device which may be, for instance, the tuning condenser of the radio receiving set, and on the other hand, contact can be established with an arm in electrical connection with a circuit breaker means, whereby the current supply may be cut off at such times as it is desued to stop the reception of programs. Circuits through the first arms--that is, those controlling the initiation of tuning movement-are led through a shiftable or oscillatable member consisting essentially of rings or segments having their ends circumferentially separated, whereby current is led through the same to a means such as a reversible motor, by means of which motor the segments are themselves turned, and these segments, being connected to operate the circuit tuning device,--for instance, being connected on the same shaft with the condenserare rotated with the condenser until such time as the circuit to the motor is broken by the brush carrying the current coming opposite the gap between the segments. This stops the movement and the gaps are so posi tioned that the circuit tuning device, the condenser, will be left exactly in position corresponding to a desired and predetermined tuning. The radio set is then in position to receive a given program. There is also included in the device a circuit making and breaking means whereby, when shifting movement of the circuit tuning device is initiated, the tuned circuit is closed and energized, and when the stop arm is energized the tuned circuit is deenergized. Since at times it will be desirable to shut off the radio set and later to turn it on to the same station, means are provided to energize the tuned circuit in such an instance without the initiation of shifting movement of the circuit tuning device.

The parts, their relationship, and the constructions employed will be better understood by specific reference to particular cases, and to the drawings, wherein is shown an illustrative embodiment of our invention, but one which, it should be understood, is not to be construed as limiting us to any precise arrangement.

The 'timekeeping mechanism may be of various kinds, and we have therefore illustrated it in Figures 3 and 4 as consisting of a dial ll about which sweeps a single hand II pointing to hours arranged about the dial, and at the appropriate positions about the dial there are located plug members I and IS, the former being those plugs which initiate shifting of the circuit tuning device or energization of the tuned circuits, and the latter being those which deenergize the tuned circuits. In other words, the plugs l are station selector and energizing plugs, while the plugs I! are stop plugs.

The time-keeping mechanism itself is indicated in Figure 4 at II, and upon its arbor l3, movable with the single hour hand, is mounted a contact arm I carrying contacts II, II, II, It, I5, etc., which are the station selector contacts, and the contact I9, which is the stop contact. These are connected to the respective rings II, II, II, 24', II, and I0, whence brushes, designated in general by the numeral I6, lead the current off through the respective leads Ila, IIa, Ila, Ila, 25a, and Illa. The plugs l and II are provided with notches I4 and spring detents Ii by means of which they can be positioned in selected positions. The contact I on any particular plug I may be positioned to contact with any one of the station selector contacts II to I5 inclusive, or may be out of contact entirely, and similarly, the contact II on any particular plug I! may or may not contact with the stop contact I9. Each of the plugs I and each of the plugs I 9 is connected to a source of power by a lead II. This source of power may be the sevenvolt power pack of the set which is to be controlled. Thus each of the plugs I and I! is alive when the set is in operation, and when its contact l6 or II makes contact with one of the corresponding contact points on the arm I the circuit including that contact point is energized.

contact point lie, 20, etc., is positioned in one I of the two gaps of the respective segments.

These series of segments may be mounted for independent angular adjustment upon a suitable insulating cylinder which in turn is supported for rotation upon a spindle 4, this spindle being connected to or identical with the spindle which shifts the plates 50 of the tuning condenser, generally indicated at 5.

In conjunction with the spindle 4 there are mounted two bus members All and 40'. To these are connected the leads 40a and "b respectively which lead to a motor 46, which in the form shown is reversible, the energization of the lead Illa causing rotation of the motor in one direction, and energization of the lead lllb causing its rotation in the opposite direction. The third lead to the motor is indicated at 46'. Rotation of the motor causes rotation of its spindle I, and through a suitable connection, such as the worm 48' and pinion 48, this reacts to rotate the spindle l and the series of segments mounted thereon. so that the latter are rotated, but since current to th'motor 46 comes through one of the leads Ila to 25a, the current supply to the motor is cut oil as soon as the corresponding brush II to 35 comes opposite its gap between the corresponding segments. The condenser plates I. at this instant are in a given tuned position, ready to pick up a selected station. The segments or rings are so adjusted angularly. when the set is first put into use, as to eifect this result. If, at a later time, it is desired to change the station tuned by a given ring, such as when the set is moved to another locality, such ring may again be adjusted angularly to the new position. Likewise if the set installation is changed, such as where a different type of antenna is employed, and the same station position shifts slightly on the tuning dial, its ring may be shifted a corresponding amount so that exact automatic tuning may again be secured. The gear 48 is frictionally held to the insulated core ll, carrying the segments lla, lib, 42a, lIb, etc., whereby manual adjustment of the condenser I is permitted, without disturbing the gears II and ll. All the segments and the condenser plates 5. move as a connected unit, whereby the relationship between them is not disturbed by such manual adjustment, and the device is free to resume automatic operation from whatever polltion parts are left by the manual adjustment.

At BI and 6| are switch points, the one fixed and the other mounted upon a bar I, and these switch points are connected by the leads a and Gla to the -volt power source and to the set and power pack, respectively, so that upon breaking contact between the points II and II the supply of current to the set is broken and the tuned circuit thereof is deenerglzed. Movement of the bar BI is controlled by a circuit breaker coil 6 operating upon an armature 03 connected to and controlling movement of the bar I. A latch III controlled by the magnet 1 holds the bar 62 in position to hold separated the contact points 60 and 6|, and is placed in this position upon energization of the circuit breaker coil 6. the coil 1 the latch bar at 10 is withdrawn sufficiently to permit movement of the bar 62 under the influence of the spring 64 to close the circuit between the points 6|] and 6|. Controlling the energization of the coil I is a current source-for instance, a bell ringing transformer-at H, and contact points 12 mounted upon the bar 62 are so positioned that when the circuit is broken between Bi] and 6| the gap between points 13 and I4 is closed. The former is connected directly to the coil 1, and the latter is connected in a lead 4| from the contact points M0, 420, etc., previously referred to. The purpose of this will appear hereafter.

Likewise carried by the bar 62 is a contact point 65 which, when the contact points 60 and 6| are in contact, is also in contact with a fixed contact point 66. The bridge member 12, previously referred to, is connected by a lead 15 with the contact point 65, and the latter in turn is connected by the lead 46, previously referred to, to the motor 46. The fixed contact point 66 is connected directly to the power pack to energize the motor lead 46' when points 60 arid 6| are in contact, and this motor contact is broken when the set current is disconnected by shifting of the lever 62 to the right.

One side of the circuit breaker coil 6 is connected directly to the power pack. The circuit through this coil is closed through the live lead l8 and the lead 29a, previously referred to, which latter lead is energized when a stop plug I9 is properly positioned.

Assuming that it is desired to start the operation of the radio receiving set, we will assume that a plug I has been positioned to make contact with the contact point 2|, corresponding to the station A. The lead l8 which is connected to one side of the secondary of the transformer H (the primary of which is always energized), renders the contact |6 alive, and this, contacting with the contact point 2|, sends current to the brush 3|, and if this brush is on its segment M0, or 4|b, current passes by the lead 400 or 401) through the motor, and thence the current is led by the lead 46' and the lead 15 to the contact points 12 and 13, through the latch coil 1, and back to the opposite side of the power source (the transformer). The coil 1 is momentarily energized, the latch bar 10 is withdrawn] and contact is established between the points and 6|, whereupon the power pack is energized.

Energization of the power pack energizes the lead l8, but now from the latter source (the former circu t being broken by shifting of the bar 62 and switch point 12 mounted thereon, separating the switch points 12 and 13). Current from the new source, the power pack, reaches the motor along the same path as before, but the lead 46' is connected through. the now closed switch points 66 and to the power pack. The motor armature, therefore, rotates in the direction determined by the energization of one of the alternate leads 400. or 40b.

The above action was predicated on the con-'- tact between the brush 3| and either the segment 4|a or 4|b, but if the brush 3| had been in position illustrated in Figure 1 where it contacts only with the contact point Me, the current would have passed then by the lead 4| to the contact point I4 and thence by the contacts 12 and 13 However, upon energization of through the latch coil 1, and the same operation would have taken place. In this latter case there would not have resulted any energization of the motor 46, but in the former case it is slightly different.

Let us assume that the brush 3| was in contact with a segment 4|b. Current then passed through the motor, as has already been described. It commences to rotate, and as it rotates, the segments Ma. and 4|b and all the other segments of the series are rotated, rotating the condenser plates 50 through the least angular distance until the brush 3| comes opposite a gap between the segments. At that time current supply to the motor 46 is broken, and because contact is broken between the points 14 and I2 the power pack will not be shorted through the circuit 4| of a contact point 4|c, and'the motor circuit may not be reestablished even though the brush comes into contact with a contact point M0, for it is not included in either of the motor circuits 40a or 4612. This leaves the tuned circuits energized and the circuit tuning device 5 positioned at some selected tuned position which, it had been previously determined, corresponds to the station A.

Now if we desire to stop the reception from that staton at a given hour, the plug l9 correponding to this hour is placed in position to bring its contact IT in .contact with the contact point 29, the plug for such hour being in other than a station-selecting position. Current now passes from the lead l8 to the contact point ll of this particular plug l9, to the contact point 29 and lead 29a, through the circuit breaker coil 6, and back to the opposite side of the power source. The coil 6 is energized, attracts the armature 63, and the'latch 10 drops down to hold the bar 62 retracted, thus breaking the circuit between the contact points 6|) and 6|. This leaves the tuned circuits set as before but deenergized.

'Now let us assume that at a later hour we desire to hear the same station again. Contact being established between the proper contact l6 and the contact point 2|, the current is led by the lead 2|a to the brush 3|, and now through the contact point M0, and the result is, as previously explained, that the latch magnet I is energized, releasing the bar 62; the contact points 60 and 6| are again brought into contact, and since the tuning position of the circuit-tuning device was not changed by deenergizing the circuit, and since the circuit is reenergized by the closing of the points 60 and 6|, the action just described again places the circuit in condition to receive the signals from the selected station A. The motor 46 remains dead. It is only energized when the brush, as 3|, is in contact with one of the segmentsl la. or 4|b.

Let us assume that after hearing one station for a time, or after the set has been deenergized, it is desired to hear another station at a later time. The plug for the selected hour is set at a selected position (in three notches) to cause its contact IE to make contact with the contact point 23 corresponding to the station C. Current now comes from the lead H! to the lead 23a, thence to the brush 33, and contact is established with'one or the other of the segments 43a or 43b. One or the other of these conducts the current by the lead 40a or 4012 to the motor 46, and thence current passes by the lead 46' and the contact 65, back to the opposite side of the power source (the power pack or secondary of the transformer 1|), and the motor is immediately energized without the circuit at 6|) and 6| being broken, if it is not already broken, or after it has been reestablished in the manner described if it has been broken, and the rotation of the motor armature causes rotation of the series of segments or rings until such time as the brush 33 comes opposite a gap between segments, thus stopping the motor, at which time the rotation of the tuning plates 50 has progressed far enough to bring the circuit to a tuned position corresponding to the position required to receive station C.

In Figure 5 has been illustrated an auxiliary device whereby there can be included in the control an automatic volume control. Each of the brushes 3| to 35 inclusive corresponds to some selected station. Assume that a particular station-for example, the one corresponding to brush 3lrequires greater volume than another station. We can connect to that brush the con tact points 80 and ill connected to an adjustable rheostat 8 which is included in or which affects the tuned circuit, or an associated circuit. This rheostat is initially adjusted to give the desired volume for that particular station. The points 80 and 8| are held apart when the station A corresponding to the brush IN is not tuned in, but when this station is tuned in, the brush 3| drops into the gap between the segments Ma. and Mb, and this drop permits contact to be established between the points 80 and 8|, so that when this station is tuned in, the automatic volume control for that particular station will be effective.

What we claim as our invention is:

1. In combination, a shiftable circuit-tuning device, a plurality of revolubly shiftable contact rings operatively connected to the circuit-tuning device to shift the same to different tuned positions, a brush in contact with each ring, the rings being broken into two insulated halves to form a gap at such points, relative to the positions of the corresponding brushes, as will position the circuit-tuning device in a definite tuned position when the brush registers with the gap, a reversible motor operable to shift the series of rings, and connected electrically with the two half rings, thereby to determine its direction of movement, and to terminate movement of the rings and the connected circuit-tuning device at definite selected tuned positions when the brush registers with the gap, time-keeping mechanism, and a series of contact arms movable with the timekeeping mechanism, and each corresponding to one of said rings, and therefore to a definite tuned position of the circuit-tuning device, selective plugs disposed in the path of the said contact arms and movable to energize a selected one at a given time.

2. In combination, a shiftable circuit-tuning device, a plurality of revolubly shiftable contact rings operatively connected to the circuit-tuning device to shift the same to different tuned posi tions, a brush in contact with each ring, the rings being broken into two insulated halves to form a gap at such points, relative to the positions of the corresponding brushes, as will position the circuit-tuning device in a definite tuned position when the brush registers with the gap, a reversible motor operable to shift the series of rings, and connected electrically with the two half rings, thereby to determine its direction of movement, and to terminate movement of the rings and the connected circuit-tuning device at definite selected tuned positions when the brush registers with the gap, time-keeping mechanism, a series of contact arms movable with the time-keeping mechanism, and each corresponding to one of said rings, and therefore to a definite tuned position of the circuit-tuning device, selective plugs disposed in the path of the said contact arms and movable to energize a selected one at a given time, a circuit breaking means connected in the set power circuit, a further contact arm movable with the time-keeping mechanism and electrically connected to the circuit breaking means, and a second series of plugs disposed in the path of the latter contact arm, and movable to engage and energize the same, and the connected circuit breaker, at a given time.

3. A radio receiving set control, comprising a shiftable circuit-tuning device, a rotor movable therewith, a contact ring mounted on said rotor, including two segments spaced circumferentially to form a gap, a contact point within such gap, a volume control device preset to a value corresponding to the reception volume desired for a particular station, and a brush, corresponding to the frequency of such station, to contact said ring and said contact point, said circuit-tuning device being tuned to the frequency of such station when the brush is in registry with said gap and in contact with said contact point," and contact of said brush with said contact point operating to complete a circuit through said brush and said volume control device.

4. A radio receiving set control, comprising a rotatable circuit-tuning device, a rotor coupled thereto, a contact ring mounted on said rotor, including two segments spaced circumferentially to form a gap, a volume control device preset to a value corresponding to the reception volume desired for a particular station, a brush, corre sponding to the frequency of such station, to contact said ring, means to rotate said rotor relatively to said brush to effect tuning movement of said device, means operable to displace the end of said brush upon disposition thereof in registry with said gap, and means operated by said brush displacement to initiate operation of said volume control device.

5. A radio receiving set control, comprising a rotatable circuit-tuning device, rotary station selecting means coupled thereto, segments thereon each corresponding to a tuned reception frequency of said circuit-tuning device, volume control means for each segment, preset to a value suitable for the station corresponding to the tuned reception frequency of the respective segment, contact means engageable with said station selecting means, means to rotate said station selecting means, means operable to displace said contact means upon disposition thereof in registry with a selecting means segment corresponding to a tuned position of said circuit-tuning device, and means operated by such displacement of said contact means to initiate operation of said volume control device.

6. A radio receiving set control mechanism, comprising a shiftable circuit-tuning device, a contact ring shiftable therewith and including two segments spaced circumferentially to form a gap, means to shift said ring including an electric circuit through a ring segment, a contact point within said gap, means to control the power circuits of the receiving set including an electric circuit through said contact point, a brush, corresponding, when in registry with the gap, to a tuned position of said device, to contact said ring, and circuit-completing means for said brush, of such a character that said ring shifting means is energized to shift the ring by completion of its circuit through a ring segment. 76

said brush and its circuit-completing means, and

said controlling means is energized to control the power circuits of the receiving set by completion of its circuit through said contact point, said brush and its circuit-completing means.

7. In a, radio receiving set control, a rotatable circuit-tuning device, a reversible motor to rotate said device, a station selecting member coupled to rotate with said circuit-tuning device, and including a contact ring formed of two segments spaced circumferentially to form a gap, a brush adapted to contact said ring, a contact point engageable by said brush upon its registry with said gap, a motor energizing circuit including one of saidring segments, a motor reversing circuit including the other of said ring segments, switching means to control operation of the set power circuits including a circuit through said contact point, and means operable to energize said brush.

8. In a radio receiving set control, a rotatable circuit-tuning device, a contact ring rotatable therewith and including two segments spaced circumferentially to form a gap, a brush adapted to engage said ring, a contact point engageable by said brushupon its registry with said gap, a switch for controlling the'set power circuits, switch actuating means in circuit with said two contact ring segments and said contact point,'and means operable to energize said brush for completion of a circuit through the one of said contact point and segments engaged by said brush and through said switch actuating means to operate said switch.

9. In a radio receiving set control, a shiftable circuit-tuning device, switching means for controlling the set power circuits, station selecting means including a member shiftable with said circuit tuning device, and a plurality of stationary contact members, each fixed in position relative to said shiftable member to correspond to the tuned frequency of a different selected staftion, and each engageable with said shiftable member, means to select a particular one of said stationary contact members for operative control, means, controlled by engagement of said particular contact member with said shiftable member, to stop movement of said shiftable member at a position to receive the station corresponding to said particular stationary contact member, and means disposed for engagement by said particular stationary contact member when in tuned position to control said switching means.

10. In a radio receiving set control, a transformer having a primary and a secondary winding, means continuously energizing said primary winding, a switch for controlling the set power circuits including anarm movable between circuit-closed and circuit-open position, a switch closing solenoid operable to effect movement of said arm to circuit-closed position, an energizing circu t to complete a circuit between said transformer secondary winding and said switch closing solenoid, a switch opening solenoid operable to effect movement of said arm to circuit-open position, an energizing circuit for said switch opening solenoid, and means to break positively said first enegizing circuit by movement of said switch arm to circuit-closed position.

11. A radio receiving set time-control device, comprising a stationary mounting plate, a plurality of station-selecting members mounted thereon, retaining means for said members restraining removal thereof, a plurality of contact members each corresponding to a tuned frequency of said receiving set and to an adjusted position of said station-selecting members, means guiding each station-selecting member for movement between adjusted positions corresponding respectively to said contact members for selective engagement therewith, time-keeping mechanism, and means driven thereby to complete a circuit through a contact member and a station-selecting member.

12. In a radio receiving set control, time-keeping mechanism, a contact member rotated thereby, fixed contact means, a plurality of station selecting members arranged in a circle, circuitcompleting means carried by each of said members and adapted to close a circuit between said rotatable contact member and said fixed contact means at, times corresponding to the respective selecting. members, means guiding said station selecting members for reciprocation transversely of the circle, to dispose each circuit-completing means in any selected one of a plurality of positions each corresponding to a different station to be received, means to hold said station selecting members in any selected one of the several station selecting positions, and means limiting reciprocating movement of said station selecting members in both directions.

13. A radio receiving set timecontrol device, comprising a stationary mounting plate, a plurality of station-selecting members arranged in a circle and projecting therethrough, retaining means 'for said members restraining removal thereof, a plurality of contact members each corresponding to a tuned frequency of the receiving set and to an adjusted position of said station selecting members, means guiding each station selecting member for reciprocation normal to said mounting plate into adjusted positions corresponding respectively to said contact members, forselective engagement therewith, time-keeping mechanism, and a member rotated thereby in a circular path adjacent to said station selecting members for contact therewith.

14. A radio receiving set time-control device comprising a plurality of electric circuits corresponding respectively to a plurality of possible tuned reception frequencies, a clock, a mounting permanently securing each member in said mounting plate adjacent to its corresponding time, as indicated by the numerals on the clock face, means guiding each member for selective reciprocation to assume any desired one of a plurality of possible positions, such positions corresponding respectively to said plurality oi electric circuits and their tuned reception frequencies, and means for adjusting each member for operation at its particular fixed time to complete the electric circuit corresponding to the adjusted position assumed by such member, to effect tuning of the set to the respective reception frequency.

15. A radio receiving set control, comprising time-keeping mechanism, a contact member having an elongated contact-bearing surface rotated thereby in a path defining the surface of a cylinder, a plurality of reciprocable station-selecting members defining the surface of a cylinder of larger diameter than the path of said contactbearing surface, contact means carried by said station-selecting members, and projecting inward therefrom for engagement with said elongated contact bearing surface, means guiding said station-selecting members for reciprocation into any one of a plurality of station-selecting positions, a circuit-tuning device, and control means thereior completing a circuit between said contact member and a station selecting member.

16. A radio receiving set control, comprising time-keeping mechanism, a plurality oi selector members arranged in a circle, an inner contact member rotated by said time-keeping mechanism about a circle concentric with the selector member circle but of smaller diameter, a plurality of outer contact members arranged about a circle concentric with the selector member circle but of greater diameter, means carried by each selector member, extending radially outward and inward therefrom, to engage simultaneously an inner and an outer contact member to complete a circuit therebetween, and means energizable by completion of such circuit to control the radio receiving set.

17. A radio receiving set time-control device, comprising time-keeping mechanism, a contact member driven thereby, mounting means, a pillrality of station-selecting members mounted thereon and each movable between operative positions and an inoperative position, retaining means for said station-selecting members restraining removal thereof irnm said mounting means, means normally holding each stationselecting member in its inoperative position to avoid contact with said contact member, and means guiding each of said station-selecting members for movement at will into an operative position for contact with said contact member at a fixed time.

18. A radio receiving set time-control device, comprising time-keeping mechanism, a contact member rotated thereby, a mounting plate, a plurality of station-selecting members disposed in a circle thereon, retaining means restraining removal of said station-selecting members from said plate, means normally holding each stationselecting member in the inmost position to avoid contact with said contact member, means guiding each station-selecting member for reciprocation at will normal to said plate from such inmost position into operative positions in the path 01' said contact member for contact therewith, and means limiting outward movement of said station-selecting members.

THOMAS A. CHENEY. HARRY J. KRINKE. 

